Enhanced app with Vector Search support

- Updated README.md with details on Vector Support in Azure SQL Database, application functionalities, and setup instructions.
- Removed inheritance of `Question` class from `Search` class and deleted `Search` class.
- Minor adjustment in Program.cs for endpoint description consistency.
- Simplified appsettings.Development.json by removing the empty "ConnectionStrings" section.
- Enhanced Script.sql with SQL commands to create `DocumentChunks` and `Documents` tables, including schema for identifiers, content, embeddings, document names, creation dates, and established a foreign key relationship between the two tables.

Script.sql

@@ -0,0 +1,30 @@
+CREATE TABLE [dbo].[DocumentChunks](
+	[Id] [uniqueidentifier] NOT NULL,
+	[DocumentId] [uniqueidentifier] NOT NULL,
+	[Content] [nvarchar](max) NOT NULL,
+	[Embedding] [varbinary](8000) NOT NULL,
+ CONSTRAINT [PK_DocumentChunks] PRIMARY KEY CLUSTERED 
+(
+	[Id] ASC
+)) 
+GO
+
+CREATE TABLE [dbo].[Documents](
+	[Id] [uniqueidentifier] NOT NULL,
+	[Name] [nvarchar](255) NOT NULL,
+	[CreationDate] [datetimeoffset](7) NOT NULL,
+ CONSTRAINT [PK_Documents] PRIMARY KEY CLUSTERED 
+(
+	[Id] ASC
+)) 
+GO
+
+ALTER TABLE [dbo].[DocumentChunks] ADD  CONSTRAINT [DF_DocumentChunks_Id]  DEFAULT (newid()) FOR [Id]
+GO
+
+ALTER TABLE [dbo].[Documents] ADD  CONSTRAINT [DF_Documents_Id]  DEFAULT (newid()) FOR [Id]
+GO
+
+ALTER TABLE [dbo].[DocumentChunks]  WITH CHECK ADD  CONSTRAINT [FK_DocumentChunks_Documents] FOREIGN KEY([DocumentId])
+REFERENCES [dbo].[Documents] ([Id])
+GO